id like to chime in here ,the trs does not have an oil pump as you are thinking,but what it does have is a sort of metal slinger about 5/16 diameter rod wrapped around the short coupler and welded to it the coupler is the part that connects the upper and lower gearcases together and helps to move oil around,i dont suspect its much different than the gears moving it around..when you add spacers in between the cases the connector that you use then doesnt have this feature and the drives work just as well,torque kills drives,no matter how much you move the oil around

So then they could benefit from exterior cooling?

All it is is a piece of round stock which spirals around the verticle shaft coupler between the upper and lower. Kinda works like a screw moving the lube.There is a second large passage between the upper and lower so it can return.

Get a 357, add a Jenny, keep the drive lube monitor full and run em.

Except for the 10/15% loss through the borgs, I could not be happier. There is a plethora of parts available and the Konrad solution later

cooling has never been an issue,no shower needed..run and have fun
overanalyze takes the fun out of boating.................

I am quite a detail oriented guy. As a tech I am hard pressed to make sure the "I's" are dotted and the "T's" are crossed. When I leave the dock I have every intention of returning with my own power and I diligently do my homework to make sure that happens....long or short run. You got me pegged, I am anal about getting the tech stuff right. When I turn the key and leave the dock it is full reward for my efforts and I don't worry one bit about it.

Thanks for the info and I will try to not over analyze.

I follow you. At several thousand rpm's I guess that little spiral should circulate pretty well then. If they don't have heat problems then it is effective enough. Sounds like a strong reason why they are rotation specific so the spiral is rotating in the right direction.
I like it.

Here's what you would be looking at Aqua. Coupler connects upper and lower vertical shafts. It actually pushes the lube down from the top and it returns back up through another passage.

Oh yes, a picture is worth a thousand words. Nice device. So can the coupler be put in either way? Can it circulate in either direction?

Are the props the same as a bravo for fitment?

Yes it can go in either way, the spirling will still be the same. Only circulates in one direction, that's down. Vertical shafts all turn the same direction. Left and right hand rotation is determined past this point on the propeller shaft.

Props are all the same, TRS, Bravo, Alpha. At least for the most part.